Hay hoist



March 18, 1952 A. PEHRspN i HAY HoIsT 4 sheets-sneek 1 Filed Nov.V 15, 1946 I NV EN TOR. WJZRZI'JW? e' 0,4%@ MMM/- March 18, 1952 A. PEHRsoN 2,589,855

HAY HoI'sT Filed Nov. 15; 194e 4 sheets-.sheet 2 I N VEN TOR.

A. PEHRSON March 18, 1952 4 sheets-sheet 4. l

Filed Nov. 15, 1946 l INVENTOR. @y/SZ 795022 B' if ATTD RN EYB Patented Mar. 18, 1952 UNITED STATES PATENT :OFFICE HAY HOIST August Pehrson, Ferndale, Wash.

Application November 15, 1946, Serial No. `'710,197

1 Claim. l

My present invention relates generally to improvements in material and article handling of the hoist line type, and more specifically to a hay hoist of the portable appliance type including a rotary drum and hoisting cable with electrically operated driving means for the drum and a fricv'tion 'clutch between the driving means 'and the ,rotary drum. Automatically operated means including aweight are utilized for engaging the drum with the driving means for a 'braking' action as Well as for a friction driving coupling, and means for manually controlling the hoisting appliance are also provided.

The primary object of the invention is the provision of a. portable appliance of this type that includes a minimum number of parts that may with facility be manufactured and assembled to form a structure that is simple in construction and operation and capable of being controlled by one man with convenience and skill.

The invention consists is certain novel combinations `and arrangements of parts as will hereinafter be described and more fully set forth in the appended claim.

In the accompanying drawings I have illustrated one complete example of the physical embodiment of my invention wherein the Darts are combined and arranged in accord with one mode I have devised for the practical application of the principles of my invention. It will, however, be understood that changes and alterations may be made in these exemplifying drawings and mechanical structures, within the scope lof my claim, without departing from the principles of the invention.

Figure 1 is a view in side elevation of a motor- I Figure 9 is a detail view of the driving pinion and driving gear.

Figure 10 is a detail of the mounting for the cable control lever and its release spring; and

Figure 11 is a detail view disclosing the manually controlled pawl and detent as a safety device to prevent reverse rotation'of the driving gear of the clutch, and drum.

In the preferred form of the invention as shown in the drawings, the portable appliance includes a main frame F in which the joints between parts are preferably secured by welding; and the frame is provided with a horizontal extension upon which an electric motor M is mounted.

The motor frame vI is adjustable with relation to the hoisting machine, for tightening the inotor-drive, by `means of bolts 2, and the frame 'is xed in adjusted position by vsuitable means as by bolt-hooks 3.

Power from 'the motor .is transmitted by means of a drive pulley 4 of the motor and belt 5 `to a large driving pulley 6 which is fixed upon a rdrive shaft 'I that is journaled in bearings 8 `and 9 of an upright triangular extension I0 of the frame F.

On the drive shaft of the hoisting machinery a drive pinion II is fixed and in constant mesh with a large driven gear I2 having an annular clutch plate I3 mounted on its innei side for frictional contact with a circular head or an'ge I of the winding drum I5, and the drum is lon"- gitudinally slidable on its shaft 'I6 for Vfrictional or clutching engagement with the clutch plate 'I4 that forms the driving member .of the vfriction clutch.

The drum is loosely journaled upon Ashaftvlli,V

and the shaft is mounted at the apex I.'I of the triangular upright frame II) of vthe main frame F.

As best seen in Fig. 11, a safety 10a-wl I 8 vis pivoted upon the frame I Il for vco-action with a 'stoplug' I9 of the gear wheel I2, for use in manual control to prevent reverse rotation of the `drivegear wheel I2, which, under normal loperations is continuously revolved from the motor M. One end of a hoist `cable or rope 20 is attached by a bolt and clamp 2|v to the exterior of the cylindrical winding drum, and this cable passes through an eye or loop 22 mounted :at the vupper end of a cable control lever 23 which at its lower end vis pivoted at 24 to the upright frame I0.

.As best seen in Fig. 10, by means of an arcuate bar 25 pivoted to the lever 23, and spring 26 mounted on the bar and vconfined between the lever and a cross bracket I0' of the v frame I0, the

plied by the electric motor M, and the free fend of the cable or rope 20 is attached 'to a hay fork; when the fork has been placed in a load of hay a pull on rod or wire 21 .closes a 4conventional electric control switch 28 of the motor M in a manner to appear and the motor operates the coupled `gear rand drum to lift the loaded fork. By continued rotation of the drum the load is hoisted up to a track located at the top of the mow and the loaded fork runs along `the track to the point for depositing the load on vthe mow. The control box 28, in which the switch or clicuit control for the motor M is mounted, is rigidly supported by a frame 29 (Figs. 1 and 2), and the pull rod or wire 27, which may have a pull cord C (Figs. 1 and 5) attached thereto; is supported to slide up' and down in a guide 29D.

so that 'in a manner to vbe explained 'an `ini-Cial lift of the rod 21 will close the switch, thereby activating the motor, which transmits power to the driving gear. Then an additional pull on the wire 21 actuates lever mechanism to shift the drum I5 longitudinally on its shaft I6 to frictionally engage the drum head I4 with the friction plate I3 of the gear wheel I2, so that the drum will revolve with the gear and wind the cable 20 thereon.

For this purpose a horizontally disposed clutch control -bar 30 is pivoted at 3| on a rod 3I carried by standards 3| on the frame F of the appliance. and the free end of the bar is provided with a weight 32. The pivoted end of bar 30 is secured to a sleeve 32' (Fig. 6) also oscillatably mounted on rod 3I. Extending upwardly from the sleeve 32 is an arm 38' adapted to bear against the lower end of an upright shift lever 36 for a purpose to become apparent. A strut 32 extending between the sleeve 32' and the bar 30 is a. reinforcing member. The weighted endof the clutch control bar 30 is lifted by a pull on rod or wire 21, the lower end of which is pivotally connected at 33 to a lug 33' attached to the arm An upright arm 34 is pivoted by a pin 34 to the bottom of the cross arm I0 and is connected by a link 35 to the lower end of an upright shift lever 36 which is pivotally mounted at 31 on the frame I of the appliance, and the head 38 of the shift lever 35 bears against washers 39 mounted on the drum shaft I6 in position to frictionally engage the drum I5, to impart the sliding movement of the drum I to cause its flange I4 to engage the clutch or friction plate I3.

When the clutch or coupling, formed by plate I3 and flange I4, is engaged, the drum I5 is revolving to wind the cable 28 thereon, the latter,

as its passes through the eye or loop 22 of the lever 23, draws this cable control lever upright and toward the drum I5, as shown in Figs. 1 and 5 and the cable control lever is held in this upright position while the drum I5 is winding the cable 20.

When the'hay fork is tripped to release its load, the pull rope or cord C is partially released manually and slackened, thus relieving tension on the uplifted rod 21 in order that the weight 32, by gravity, may depress the free end of the clutch-control bar 30, to rotate upright arm 30' ,away from the lower end of the clutch shift lever l 36 to-decrease the driving friction between plate I3 and vflange I4.

Aimpart a braking action on the drum as it frictionally engages the friction plate of the drive gear I2.

.- A maximum or 'complete depression, under gravity, of the weighted clutch control bar 38, also opens the control switch 28 for the motor M to stop the motor. For this automatic control the weight 32 of the bar 30 is provided with an actuating pin 42 that projects into a slot and is confined within the tines of a fork 43 that is pivoted at 44 on the supporting frame I0, and

g tl 1e fork 43 is connected by an upright link 45 to a lever switch arm 46 of the switch structure.

within the box or casing 28. By this means the switch 28 is opened to .break the motor circuit, and the motor is stopped.

It will be understood that the traveling hay fork and its load may be stopped at any desired point or location on its track by operation of the pull cord C, or by manual manipulation directly on the pull rod 21, and the safety pawl I8 may be engaged by hand with the stop lug I9 to prevent the drum from reverse rotation when the motor is stopped.

As thus shown and described the rotary winding drum I5 of the hay hoist may with facility be controlled by one man employing the operating mechanism for the friction clutch or coupling, without changing the motor-operated driving gear wheel. When the weighted clutch control bar 30 is elevated with its weight 32 to its maximum height, the flange I4 is frictionally engaged with the plate I3 for revolving the drum I5'by the motor M. When the weight 32 of the control bar 30 is depressed by rod 21 to its full extent the flange I4 is disengaged from plate I3 so that the drum I5 may freely revolve, as when the empty hay fork is being returned for a succeeding load. A partial elevation of the depressed control bar 30 when the cable 20 is slack will free the released cable control lever 23 to rotate the arm 4I lto cause a `braking action of the drum I5 Iby causing the clutch lever 36 to force the drum flange I4 against the stationary plate I3 of the driving wheel or gear I2.

Having thus fully described my invention, what I claim as new and desire to secure by Letters Patent is:

The combination in a hay hoist with a driving wheel having a friction plate on one side thereof, an electric motor, power transmission mechanism lbetween the motor and the Wheel, a longitudinally shiftable rotary drum having a complementary friction headthat is adapted for engagement with the friction plate on said driving wheel, said engagement causing said drum to be driven when the driving wheel is in motion and said engagement causing the drum to be braked when the driving wheel is not in motion, a cable on the drum, a cable control lever having an eye through which the cable passes, and a pivoted weighted arm coacting with the cable control lever of a pivoted drum shifting lever coacting with the drum, a pivoted clutch control bar linked with the drum shifting lever, and having a weighted end, a pull rod connected with the weighted end of the control bar, means coacting-v with the weighted arm cable control lever and the clutch control bar for applying a braking action to the drum when the cable and the cable lever are` released, a control switch for the motor, an operative connection between said pull rod and said switch so that the operation of said pull rod will lcontrol the switch for the energizing of the motor The following references are of record in the le of this patent:

UNITED STATES PATENTS Date.

Number Name 576,568 FlSble Feb. 9, 1897 1,258,393 De Camp Mar.v l5, 1918 2,006,476 v Payson July 2. 41935 

